http://arstechnica.com/information-technology/2015/10/mit-uses-wireless-signals-to-identify-people-through-walls/
MIT’s Computer Science and Artificial Intelligence Lab is developing a device that uses wireless signals to identify human figures through walls. Called RF-Capture, the technology “can trace a person’s hand as he writes in the air and even distinguish between 15 different people through a wall with nearly 90 percent accuracy,” MIT said in an announcement today.
